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FlutterApp/lib/page/task_queue_page.dart

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import 'dart:async';
import 'package:flutter/material.dart';
class TaskQueuePage extends StatefulWidget {
@override
State<StatefulWidget> createState() => _TaskQueuePageState();
}
class _TaskQueuePageState extends State<TaskQueuePage> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text("TaskQueue Page")),
body: Container(
margin: EdgeInsets.symmetric(horizontal: 4),
child: ListView(children: <Widget>[
Row(children: <Widget>[
_itemBtn('1. Future() 基本构造函数', 1, Colors.green.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn('2. Future.microtask()', 2,
Colors.pinkAccent.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn(
'3. Future.sync()', 3, Colors.blueAccent.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn(
'4. Future.then()', 4, Colors.blueGrey.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn('5. Future.whenComplete()', 5,
Colors.orange.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn('6. Future.then() + Future()', 6,
Colors.purpleAccent.withOpacity(0.4))
]),
Row(children: <Widget>[
_itemBtn('7. Future.then() + Future() 对比 6', 7,
Colors.brown.withOpacity(0.4))
])
])));
}
_itemBtn(text, index, color) {
return Expanded(
child: FlatButton(
onPressed: () => _itemClick(index),
child: Center(
child: Text(text,
style: TextStyle(color: Colors.white, fontSize: 16.0))),
color: color));
}
_itemClick(index) {
print('Current Button $index click --> start');
switch (index) {
case 1:
_taskQueue01();
break;
case 2:
_taskQueue02();
break;
case 3:
_taskQueue03();
break;
case 4:
_taskQueue04();
break;
case 5:
_taskQueue05();
break;
case 6:
_taskQueue06();
break;
case 7:
_taskQueue07();
break;
default:
_taskQueue10();
break;
}
print('Current Button $index click --> end');
}
_taskQueue01() {
Future(() => print('TaskQueue -> Future A'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask B'));
Future(() => print('TaskQueue -> Future C'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask C'));
}
_taskQueue02() {
Future(() => print('TaskQueue -> Future A'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'));
Future.microtask(() => print('TaskQueue -> Future.microtask B'));
Future(() => print('TaskQueue -> Future C'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask C'));
}
_taskQueue03() {
Future(() => print('TaskQueue -> Future A'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.sync(() => print('TaskQueue -> Future.sync D'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'));
Future.microtask(() => print('TaskQueue -> Future.microtask B'));
Future(() => print('TaskQueue -> Future C'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask C'));
}
_taskQueue04() {
Future(() => print('TaskQueue -> Future A'))
.then((_) => print('TaskQueue -> Future A -> then()01'))
.then((_) => print('TaskQueue -> Future A -> then()02'));
Future.sync(() => print('TaskQueue -> Future.sync D'))
.then((_) => print('TaskQueue -> Future.sync D -> then()01'))
.then((_) => print('TaskQueue -> Future.sync D -> then()02'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()01'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()02'));
Future.microtask(() => print('TaskQueue -> Future.microtask B'))
.then((_) => print('TaskQueue -> Future.microtask B -> then()01'))
.then((_) => print('TaskQueue -> Future.microtask B -> then()02'));
Future(() => print('TaskQueue -> Future C'))
.then((_) => print('TaskQueue -> Future C -> then()01'))
.then((_) => print('TaskQueue -> Future C -> then()02'));
}
_taskQueue05() {
Future(() => print('TaskQueue -> Future A'))
.then((_) => print('TaskQueue -> Future A -> then()01'))
.then((_) => print('TaskQueue -> Future A -> then()02'))
.whenComplete(() => print('TaskQueue -> Future A -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.sync(() => print('TaskQueue -> Future.sync D'))
.then((_) => print('TaskQueue -> Future.sync D -> then()01'))
.then((_) => print('TaskQueue -> Future.sync D -> then()02'))
.whenComplete(
() => print('TaskQueue -> Future.sync D -> whenComplete()'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()01'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()02'))
.whenComplete(
() => print('TaskQueue -> Future.delayed B -> whenComplete()'));
Future.microtask(() => print('TaskQueue -> Future.microtask B'))
.then((_) => print('TaskQueue -> Future.microtask B -> then()01'))
.then((_) => print('TaskQueue -> Future.microtask B -> then()02'))
.whenComplete(
() => print('TaskQueue -> Future.microtask B -> whenComplete()'));
Future(() => print('TaskQueue -> Future C'))
.then((_) => print('TaskQueue -> Future C -> then()01'))
.then((_) => print('TaskQueue -> Future C -> then()02'))
.whenComplete(() => print('TaskQueue -> Future C -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask C'));
}
_taskQueue06() {
Future(() => print('TaskQueue -> Future A'))
.then((_) {
print('TaskQueue -> Future A -> then()01');
return Future.delayed(Duration(seconds: 1),
() => print('TaskQueue -> Future.delayed D'));
})
.then((_) => print('TaskQueue -> Future A -> then()02'))
.whenComplete(() => print('TaskQueue -> Future A -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()01'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()02'))
.whenComplete(
() => print('TaskQueue -> Future.delayed B -> whenComplete()'));
Future(() => print('TaskQueue -> Future C'))
.then((_) {
print('TaskQueue -> Future C -> then()01');
return scheduleMicrotask(
() => print('TaskQueue -> scheduleMicrotask C'));
})
.then((_) => print('TaskQueue -> Future C -> then()02'))
.whenComplete(() => print('TaskQueue -> Future C -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask B'));
}
_taskQueue07() {
Future(() => print('TaskQueue -> Future A'))
.then((_) {
print('TaskQueue -> Future A -> then()01');
Future.delayed(Duration(seconds: 1),
() => print('TaskQueue -> Future.delayed D'));
})
.then((_) => print('TaskQueue -> Future A -> then()02'))
.whenComplete(() => print('TaskQueue -> Future A -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask A'));
Future.delayed(
Duration(seconds: 2), () => print('TaskQueue -> Future.delayed B'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()01'))
.then((_) => print('TaskQueue -> Future.delayed B -> then()02'))
.whenComplete(
() => print('TaskQueue -> Future.delayed B -> whenComplete()'));
Future(() => print('TaskQueue -> Future C'))
.then((_) {
print('TaskQueue -> Future C -> then()01');
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask C'));
})
.then((_) => print('TaskQueue -> Future C -> then()02'))
.whenComplete(() => print('TaskQueue -> Future C -> whenComplete()'));
scheduleMicrotask(() => print('TaskQueue -> scheduleMicrotask B'));
}
_taskQueue10() {
scheduleMicrotask(() => print('microtask #1 of 3'));
Future.delayed(Duration(seconds: 1), () => print('future #1 (delayed)'));
Future(() => print('future #2 of 4'))
.then((_) => print('future #2a'))
.then((_) {
print('future #2b');
scheduleMicrotask(() => print('microtask #0 (from future #2b)'));
}).then((_) => print('future #2c'));
scheduleMicrotask(() => print('microtask #2 of 3'));
Future(() => print('future #3 of 4'))
.then((_) => new Future(() => print('future #3a (a new future)')))
.then((_) => print('future #3b'));
Future(() => print('future #4 of 4'));
scheduleMicrotask(() => print('microtask #3 of 3'));
}
}